
Anguish |

Wow, nobody commented on this? Shame...
Many of us got this as a stretch goal part of the Ultimate Psionics Kickstarter, so there won't be as much traffic relative to DSP's newer products.
Can anyone tell me of this is Letter size or A4, or maybe even both? Also, do the cards adhere to the 'standard' format so you can use MtG protection sleeves?
The page size in the PDF is 2.75" x 3.75"
A quick Google search suggests MtG cards are 2.5" x 3.5"
Each card has a blue border around the "card" image. So you've got a white box with the power's text on it surrounded by a blue border. That border has got to account for at least a quarter-inch. That said, you'll need a method to multi-print if you're trying to print onto larger cardstock, to get more than one card on a page.
You're looking at 503 card faces after excluding the OGL and the front cover. Most powers fit on one card face but some are too long and span onto a second (or even third) face, because there's simply too much text to fit on one face.
Jeremy from Dreamscarred did make some physical printed cards for backers, but I know it was a nightmare. Poor guy had to buy a commercial cutter and was handling the sets by hand. He may chime in and offer more input than I can, but hopefully this helps for now.

Anguish |

Thanks for the reply! So if I got this right, every power card is a single page in the PDF? There aren't aligned as, say, 3x3 cards per page? That sounds a bit weird... but still, should be doable to get that stuff printed.
Correct. It is a 508-page PDF with the dimensions I specified.
2.75 x 3 wide is 8.25" Typically printers have a quarter-inch non-printable region around a page border, so Letter (8.5" x 11") won't fit three wide. That said, again, there's that blue border around each card. When that's treated as cutting space, you should be able to fit three wide.
3.75 x 3 tall is 11.25". This could get trickier, but might be do-able. I don't currently have software installed on this machine that I can conveniently play with the layout to tell you for sure.
So, you might be able to fit 9 to a Letter-sized page. Probably 6.